本文实例讲解了javascript跑马灯抽奖特效，特别适合用于抽奖活动，分享给大家供大家参考，具体内容如下
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>抽奖游戏</title>
<style>
#box{
width:720px;
margin:0 auto;
margin-top:20px;
box-shadow:0px 0px 2px #333;
}
.pic{
width:200px;
height:200px;
float:left;
line-height:200px;
margin:10px;
border:5px #fff solid;
color:blue;
font-size: 35px;
text-align: center;
}
.anniu{
width:200px;
height:200px;
float:left;
margin:10px;
}
#drawBtn{
color:red;
font-size:30px;
width:200px;
height:200px;
box-shadow:0px 0px 2px #333;
font-weight: bold;
}
</style>
<script>
window.onload=init;
var setting={
count:0,
total:24,
delay:20,
picIndex:[0,1,2,4,7,6,5,3]
}
function init(){
document.getElementById("drawBtn").onclick=function(){
setting.count=0;
setting.delay=20;
this.disable=true;//禁用按钮
var drawBtn=this;
//获取所有图片的div
var allDivs=document.getElementsByClassName("pic");
//获得一个随机整数，代表中奖的那个位置，3*8+(0-7)
setting.total+=Math.floor(Math.random()*allDivs.length);
//设置定时器，依次修改每个div边框的颜色.
setTimeout(function show(){
//重置上一个边框的颜色
for (var i=0;i<allDivs.length;i++){
allDivs[i].style.borderColor="#fff";
allDivs[i].style.opacity=0.7;
}
//找到要修改的那个边框的颜色设置
var currentPic=allDivs[setting.picIndex[setting.count%8]];
currentPic.style.borderColor="red";
currentPic.style.opacity=1.0;
setting.count++;
setting.delay+=2*setting.count;
if(setting.count>setting.total){
alert("您中奖了，哈哈");
drawBtn.disable=false;
return;
}
setTimeout(show,setting.delay);
},setting.delay);
}
}
</script>
</head>
<body>
<div id="box">
<div class="pic">1</div>
<div class="pic">2</div>
<div class="pic">3</div>
<div class="pic">4</div>
<div class="anniu"><input type="button" value="我要抽奖" id="drawBtn"/></div>
<div class="pic">5</div>
<div class="pic">6</div>
<div class="pic">7</div>
<div class="pic">8</div>
</div>
</body>
</html>
以上就是本文的详细内容，希望对大家的学习有所帮助。
